Just one look is all it takes to see that the new Infiniti M will leave the current model's sales woes far behind in a distant memory. At least that's the way I felt when I first saw the M45 "Concept" in New York earlier this year, hardly disguised from this very impressive production version. Since its model year 2003 introduction the M45 has never taken hold of the midsize luxury market, due in part to conservative mid-pack styling and heavy-handed performance.